Hair roller



FIG. 1 is a perspective view of the front and right sides of the hair roller in accordance with the principles of the present disclosure;

FIG. 2 is a left side elevation view of the hair roller, the right side elevation view being a mirror image thereof;

FIG. 3 is a top plan view of the hair roller; and,

FIG. 4 is a bottom plan view of the hair roller.

The broken lines illustrate portions of the hair roller and form no part of the claimed design. 

CLAIM The ornamental design for a hair roller, as shown and described. 